1 | // SPDX-License-Identifier: GPL-2.0 |
2 | /* |
3 | * builtin-config.c |
4 | * |
5 | * Copyright (C) 2015, Taeung Song <treeze.taeung@gmail.com> |
6 | * |
7 | */ |
8 | #include "builtin.h" |
9 | |
10 | #include "util/cache.h" |
11 | #include <subcmd/parse-options.h> |
12 | #include "util/debug.h" |
13 | #include "util/config.h" |
14 | #include <linux/string.h> |
15 | #include <limits.h> |
16 | #include <stdio.h> |
17 | #include <stdlib.h> |
18 | |
19 | static bool use_system_config, use_user_config; |
20 | |
21 | static const char * const config_usage[] = { |
22 | "perf config [<file-option>] [options] [section.name[=value] ...]" , |
23 | NULL |
24 | }; |
25 | |
26 | enum actions { |
27 | ACTION_LIST = 1 |
28 | } actions; |
29 | |
30 | static struct option config_options[] = { |
31 | OPT_SET_UINT('l', "list" , &actions, |
32 | "show current config variables" , ACTION_LIST), |
33 | OPT_BOOLEAN(0, "system" , &use_system_config, "use system config file" ), |
34 | OPT_BOOLEAN(0, "user" , &use_user_config, "use user config file" ), |
35 | OPT_END() |
36 | }; |
37 | |
38 | static int set_config(struct perf_config_set *set, const char *file_name) |
39 | { |
40 | struct perf_config_section *section = NULL; |
41 | struct perf_config_item *item = NULL; |
42 | const char *first_line = "# this file is auto-generated." ; |
43 | FILE *fp; |
44 | |
45 | if (set == NULL) |
46 | return -1; |
47 | |
48 | fp = fopen(file_name, "w" ); |
49 | if (!fp) |
50 | return -1; |
51 | |
52 | fprintf(fp, "%s\n" , first_line); |
53 | |
54 | /* overwrite configvariables */ |
55 | perf_config_items__for_each_entry(&set->sections, section) { |
56 | if (!use_system_config && section->from_system_config) |
57 | continue; |
58 | fprintf(fp, "[%s]\n" , section->name); |
59 | |
60 | perf_config_items__for_each_entry(§ion->items, item) { |
61 | if (!use_system_config && item->from_system_config) |
62 | continue; |
63 | if (item->value) |
64 | fprintf(fp, "\t%s = %s\n" , |
65 | item->name, item->value); |
66 | } |
67 | } |
68 | fclose(fp); |
69 | |
70 | return 0; |
71 | } |
72 | |
73 | static int show_spec_config(struct perf_config_set *set, const char *var) |
74 | { |
75 | struct perf_config_section *section; |
76 | struct perf_config_item *item; |
77 | |
78 | if (set == NULL) |
79 | return -1; |
80 | |
81 | perf_config_items__for_each_entry(&set->sections, section) { |
82 | if (!strstarts(str: var, prefix: section->name)) |
83 | continue; |
84 | |
85 | perf_config_items__for_each_entry(§ion->items, item) { |
86 | const char *name = var + strlen(section->name) + 1; |
87 | |
88 | if (strcmp(name, item->name) == 0) { |
89 | char *value = item->value; |
90 | |
91 | if (value) { |
92 | printf("%s=%s\n" , var, value); |
93 | return 0; |
94 | } |
95 | } |
96 | |
97 | } |
98 | } |
99 | |
100 | return 0; |
101 | } |
102 | |
103 | static int show_config(struct perf_config_set *set) |
104 | { |
105 | struct perf_config_section *section; |
106 | struct perf_config_item *item; |
107 | |
108 | if (set == NULL) |
109 | return -1; |
110 | |
111 | perf_config_set__for_each_entry(set, section, item) { |
112 | char *value = item->value; |
113 | |
114 | if (value) |
115 | printf("%s.%s=%s\n" , section->name, |
116 | item->name, value); |
117 | } |
118 | |
119 | return 0; |
120 | } |
121 | |
122 | static int parse_config_arg(char *arg, char **var, char **value) |
123 | { |
124 | const char *last_dot = strchr(arg, '.'); |
125 | |
126 | /* |
127 | * Since "var" actually contains the section name and the real |
128 | * config variable name separated by a dot, we have to know where the dot is. |
129 | */ |
130 | if (last_dot == NULL || last_dot == arg) { |
131 | pr_err("The config variable does not contain a section name: %s\n" , arg); |
132 | return -1; |
133 | } |
134 | if (!last_dot[1]) { |
135 | pr_err("The config variable does not contain a variable name: %s\n" , arg); |
136 | return -1; |
137 | } |
138 | |
139 | *value = strchr(arg, '='); |
140 | if (*value == NULL) |
141 | *var = arg; |
142 | else if (!strcmp(*value, "=" )) { |
143 | pr_err("The config variable does not contain a value: %s\n" , arg); |
144 | return -1; |
145 | } else { |
146 | *value = *value + 1; /* excluding a first character '=' */ |
147 | *var = strsep(&arg, "=" ); |
148 | if (*var[0] == '\0') { |
149 | pr_err("invalid config variable: %s\n" , arg); |
150 | return -1; |
151 | } |
152 | } |
153 | |
154 | return 0; |
155 | } |
156 | |
157 | int cmd_config(int argc, const char **argv) |
158 | { |
159 | int i, ret = -1; |
160 | struct perf_config_set *set; |
161 | char path[PATH_MAX]; |
162 | char *user_config = mkpath(path_buf: path, sz: sizeof(path), fmt: "%s/.perfconfig" , getenv("HOME" )); |
163 | const char *config_filename; |
164 | bool changed = false; |
165 | |
166 | argc = parse_options(argc, argv, config_options, config_usage, |
167 | PARSE_OPT_STOP_AT_NON_OPTION); |
168 | |
169 | if (use_system_config && use_user_config) { |
170 | pr_err("Error: only one config file at a time\n" ); |
171 | parse_options_usage(config_usage, config_options, "user" , 0); |
172 | parse_options_usage(NULL, config_options, "system" , 0); |
173 | return -1; |
174 | } |
175 | |
176 | if (use_system_config) |
177 | config_exclusive_filename = perf_etc_perfconfig(); |
178 | else if (use_user_config) |
179 | config_exclusive_filename = user_config; |
180 | |
181 | if (!config_exclusive_filename) |
182 | config_filename = user_config; |
183 | else |
184 | config_filename = config_exclusive_filename; |
185 | |
186 | /* |
187 | * At only 'config' sub-command, individually use the config set |
188 | * because of reinitializing with options config file location. |
189 | */ |
190 | set = perf_config_set__new(); |
191 | if (!set) |
192 | goto out_err; |
193 | |
194 | switch (actions) { |
195 | case ACTION_LIST: |
196 | if (argc) { |
197 | pr_err("Error: takes no arguments\n" ); |
198 | parse_options_usage(config_usage, config_options, "l" , 1); |
199 | } else { |
200 | do_action_list: |
201 | if (show_config(set) < 0) { |
202 | pr_err("Nothing configured, " |
203 | "please check your %s \n" , config_filename); |
204 | goto out_err; |
205 | } |
206 | } |
207 | break; |
208 | default: |
209 | if (!argc) |
210 | goto do_action_list; |
211 | |
212 | for (i = 0; argv[i]; i++) { |
213 | char *var, *value; |
214 | char *arg = strdup(argv[i]); |
215 | |
216 | if (!arg) { |
217 | pr_err("%s: strdup failed\n" , __func__); |
218 | goto out_err; |
219 | } |
220 | |
221 | if (parse_config_arg(arg, var: &var, value: &value) < 0) { |
222 | free(arg); |
223 | goto out_err; |
224 | } |
225 | |
226 | if (value == NULL) { |
227 | if (show_spec_config(set, var) < 0) { |
228 | pr_err("%s is not configured: %s\n" , |
229 | var, config_filename); |
230 | free(arg); |
231 | goto out_err; |
232 | } |
233 | } else { |
234 | if (perf_config_set__collect(set, file_name: config_filename, |
235 | var, value) < 0) { |
236 | pr_err("Failed to add '%s=%s'\n" , |
237 | var, value); |
238 | free(arg); |
239 | goto out_err; |
240 | } |
241 | changed = true; |
242 | } |
243 | free(arg); |
244 | } |
245 | |
246 | if (!changed) |
247 | break; |
248 | |
249 | if (set_config(set, file_name: config_filename) < 0) { |
250 | pr_err("Failed to set the configs on %s\n" , |
251 | config_filename); |
252 | goto out_err; |
253 | } |
254 | } |
255 | |
256 | ret = 0; |
257 | out_err: |
258 | perf_config_set__delete(set); |
259 | return ret; |
260 | } |
261 | |